--- a/main_testing2/danube_test5.scala	Sat Nov 28 15:58:36 2020 +0000
+++ b/main_testing2/danube_test5.scala	Mon Nov 30 00:06:15 2020 +0000
@@ -3,25 +3,35 @@
 
 import CW7b._
 
-def urban_groupById(ratings: List[(String, String)]) = 
-  ratings.groupBy(_._1).view.mapValues(_.map(_._2)).toMap 
+def urban_groupById(ratings: List[(String, String)], 
+              m: Map[String, List[String]]) : Map[String, List[String]] = ratings match {
+  case Nil => m
+  case (id, mov) :: rest => {
+    val old_ratings = m.getOrElse (id, Nil)
+    val new_ratings = m + (id -> (mov :: old_ratings))
+    urban_groupById(rest, new_ratings)
+  }
+}
+
+//def urban_groupById(ratings: List[(String, String)]) = 
+//  ratings.groupBy(_._1).view.mapValues(_.map(_._2)).toMap 
 
 def urban_get_csv_file(name: String) : List[String] = {
   import io.Source
   import scala.util._
-  val csv = Source.fromFile(name)
+  val csv = Source.fromFile(name)("ISO-8859-1")
   csv.mkString.split("\n").toList.drop(1)
 }
 
 def urban_process_ratings(lines: List[String]) : List[(String, String)] = {
   for (cols <- lines.map(_.split(",").toList); 
-       if (cols(2).toFloat >= 4)) yield (cols(0), cols(1))  
+       if (cols(2).toInt >= 4)) yield (cols(0), cols(1))  
 }
 
 
-val urban_good_ratings = process_ratings(urban_get_csv_file("ratings.csv"))
+val urban_good_ratings = urban_process_ratings(urban_get_csv_file("ratings.csv"))
 
-val urban_ratings_map = urban_groupById(urban_good_ratings)
+val urban_ratings_map = urban_groupById(urban_good_ratings, Map())
 
 assert(suggestions(urban_ratings_map, "912").length  == 4110)
 assert(suggestions(urban_ratings_map, "858").length  == 4883)